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US 5,965,655 AGranted
Mineral filled moldable thermoplastic composition
AssigneeGeneral Electric Company
InventorsWoodie D. Mordecai, John B. Yates, Nan-I Liu
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AssigneeGeneral Electric Company
InventorsWoodie D. Mordecai, John B. Yates, Nan-I Liu
Estimating the term…
This invention is directed to an improved thermoplastic molding composition having an admixture of thermoplastic polymer or blends thereof and a particular mineral additive having needle like particles and a high aspect ratio of length to diameter. The composition when molded with the final article has improved surface characteristics, even a Class A surface, a lower coefficient of thermal expansion, as well as other improved properties, particularly impact as determined by Dynatup testing. The mineral additive can range from 5 to 70 weight percent. The polymer portion can be a copolyetherimide ester, a copolyether ester, an aromatic polycarbonate, a rubber modified homopolymer, or copolymer of a vinyl aromatic monomer, a polyphenylene ether, a polyamide, and blends thereof or blends with other polymers. The preferred mineral additive is calcium meta silicate, also known as wollastonite.
An improved thermoplastic molding composition comprising in admixture (1) a thermoplastic polymer selected from the group consisting of a copolyetherimide ester, a copolyether ester, a polyalkylene terephthalate, an aromatic polycarbonate, a rubber modified homopolymer or copolymer of a vinyl aromatic monomer, a polyphenylene ether, and blends thereof, and (2) a calcium meta silicate particulate mineral having needle like particles wherein at least 50 percent of the needle like particles have a number average mean length of about 5 .mu.m to about 25 .mu.m and a number average mean diameter of about 0.1 .mu.m to about 10 .mu.m wherein said composition is suitable for molding into articles having a Class A finish.
An improved thermoplastic molding composition comprising a polyalkylene terephthalate, and (2) a calcium meta silicate particulate mineral having needle like particles wherein at least 50 percent of the needle like particles have a number average mean length of about 5 to about 25 .mu.m and a number average mean diameter of about 0.1 .mu.m to about 10 .mu.m.
Dependencies are inferred from the claim text.